Hi blackmarker and welcome
Actually I wouldn't advise you to do either of those things.
Prediabetes means that your blood glucose level is no longer in the normal range, which is around 36-41. My opinion is that being out of normal range means something needs to be done, imstead of waiting until it gets worse (I wish I'd known when I was in the same position).
The thing that has the biggest impact on your blood glucose levels is the carbohydrate in the food that you eat. All digestable carb is digested to glucose. Some way behind that is your liver, which will dump glucose into your bloodstream when your liver thinks you need it - usually connected with adrenalin.
So it follows that if you restrict the amount of carb you take in, your system has less to deal with and (asuming it's reduced to where you can cope with it) you could find that the amount of glucose left in your blood goes down. You find out what the glucose level is by using a glucose meter and testing your blood before and after meals.
I dropped carbs almost completely over four years ago. I don't eat potatoes, bread, pastry, pasta, rice, sugar, fruit any more. Because most of what I eat now is meat, dairy, and green veg I find I only want one meal a day - and I'm not hungry. Wouldn't eat more if you gave it to me.
It's worth reading around on the forum to see what other people have done. It can all be a bit confusing at this point, so do not worry about asking questions. We've all been there.